Coffee Science - v.13, n.2, 2018

URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/10544

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Adaptation of progenies/cultivars of arabica coffee (Coffea arabica L.) in mountainous edafoclimatic conditions
(Editora UFLA, 2018-04) Krohling, Cesar Abel; Matiello, José Braz; Almeida, Saulo Roque de; Eutrópio, Frederico Jacob; Carvalho, Carlos Henrique de Siqueira
Brazil is known for production and worldwide export of coffees. Study of adaptation of new progenies/cultivars of Arabica coffee (C. arabica L.) with resistance to rust in mountainous edaphoclimatic conditions is important for crop renewal and also for new plantations. This study was performed in the mountainous region of the Espírito Santo state, Brazil, with 30 progenies/cultivars of Arabica coffee planted at 2.5 x 0.7 m spacing with four replicates and seven plants/plot. The objective of the study was to evaluate the adaptation of rust-resistance coffee genotypes and compare them with the standard cultivars (Yellow and Red Catuaís), with regards to the characteristics of productivity, rust infection, productivity, sieve, aspect, plant vigor and yield according to the different maturity periods of the fruits. The results show that there are progenies/cultivars available with yields superior to Red and Yellow Catuais for the five different maturation periods. The progenies/cultivars present tolerance/resistance to rust, high plant vigor and good agronomic characteristics of the beans. These are options for new plantations or for renovation of crops for high harvest yield and do not required the use of pesticides.
Characterization of resistance response of Coffea canephora genotypes to Meloidogyne incognita (Est I2) root-knot nematode
(Editora UFLA, 2018-04) Santos, Anderson Vieira; Rocha, Rodrigo Barros; Silveira, Silvaldo Felipe da; Teixeira, Alexsandro Lara; Matos, Sara Inácia de; Vieira Júnior, José Roberto
Meloidogynose is prominent among the factors that limit yield in C. canephora in the western Amazon, Brazil. It is caused by species of “root-knot nematode”; the most important and aggressive of these species for coffee is M. incognita. The aim of this study was to assist the selection of resistant genotypes by characterizing the reaction of 32 C. canephora clones to M. incognita (Est I2). These genotypes are selected plants from the Germplasm Bank of Embrapa Rondônia of the botanical varieties Conilon, Robusta and intervarietal hybrids. The experiments were conducted under greenhouse conditions by inoculating six seedlings for each clone with 10 ml of suspension containing 5000 eggs of a pure inoculum of M. incognita. At 150 days after inoculation, evaluations were made of fresh weight of roots (FWR), total number of galls (NG), total number of eggs (NE), and the nematode reproduction factor (RF=final population/initial population). In contrast with the susceptible controls of arabica coffee (RF=1.2) and tomato plants (RF=31.3), six clones of the Conilon botanical variety, five clones of the Robusta botanical variety and eight intervarietal hybrids reacted as resistant to M. incognita, exhibiting RF<1 and a reduced number of galls (NG mean = <10). The clones identified as resistant in this study were integrated in the coffee breeding program in Rondônia for development of cultivars resistant to the root-knot nematode adapted to tropical conditions.